<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title>选择器</title>
	</head>
	<style>
		#header{
			width: 100%;
			height: 200px;
			background-color: #361d1c;
			border: 1px solid red;
		}
		#body{
			width: 100%px;
			height: 600px;
			background-color: #55ffff;
			border: 1px solid greenyellow;
		}
		#footer{
			width: 100%;
			height: 200px;
			background-color: #55ff7f;
			border: 1px solid blue;
		}
	</style>
	<body>
		<div id="header">页头</div>
		<div id="body">页主体</div>
		<div id="footer">页尾</div>
		</div>
	</body>
</html>